LURONIUM NATANS
Common Names:- Floating water-plantain
Homotypic synonyms:- Alisma natans, Elisma natans.
Meaning:- Luronium (L) Rafineque's name for a water plantain.
Natans (L) Floating on water, swimming.
General description:- A rare stoloniferous creeping, glabrous aquatic perennial
producing slender, rooting stolons (runners) that help form mats or rosettes along
the substrate.
Leaves:-
1) Submerged, forming dense tufts or rosettes of narrow, linear, ribbon-like, or strap-
shaped leaves (up to 50 cm long in deep water). Showing a unique 'ladder-like'
venation pattern with tiny whitish flecks, when viewed underwater.
2) Floating, in shallow water, produces long-petioled leaves with distinct, elliptical to
oval-oblong blades resting on the water surface.
Flowers:-
1) Solitary flowers, roughly 8-12 mm across. emerge on delicate peduncles held just
above or floating at the water's surface.
2) Petals, 3, white, with distinct yellow spot or base on each petal.
3) Sepals, 3.
4) Stamens 6, and numerous carpels arranged in a ring or hemispherical head.
Fruit:-
1) A small, ribbed, hemispherical aggregate clusters of achenes containing tiny
seeds.
Key features:-
1) Flowers, tiny, delicate, 8-12 mm across, with 3 white petals and a distinct yellow
center, often sitting just above the water.
2) Floating leaves, ovate to elliptical, with blunt, rounded tips that taper smoothly
into the leaf stem.
3) Submerged leaves, strap-shaped or linear ribbon-like, leaves found in deeper
water, showing a unique 'ladder-like' venation pattern with tiny whitish flecks
when viewed underwater.
Toxicity:- Non-toxic and poses no known hazards to humans, domestic animals, or
livestock
Habitat:- Found naturally in oligotrophic to mesotrophic lakes, clear pools, slow-
moving rivers, and quiet or abandoned canals.
Distribution:- Primarily a western European species with its optimum in Atlantic-
influenced regions, reaching outwards into central and eastern European pockets,
including Poland, Germany, and parts of Ukraine. Nationally scarce, found in fewer
than 100 hectads. With strongholds in Central Wales, Cumbria, and canals/meres
in Shropshire and the West Midlands. Occasional or introduced populations exist in
Scotland, Ireland, and the Norfolk Broads.
Flowering time:- May to September.
Status:- Widely protected across Europe; listed as Least Concern globally by the
IUCN, but considered rare or Nationally Scarce in parts of its native range including
the UK due to water eutrophication and habitat loss.
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